Greencastle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greencastle, a borough in Franklin County, Pennsylvania.
Tonight
51°F
Mostly Clear
Mostly clear, with a low around 51. Southeast wind around 5 mph.
7-day forecast for Greencastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 75°F | Mostly Sunny | 1 to 14 mph S | 0% |
| Wednesday Night | 62°F | Mostly Cloudy then Rain Showers | 8 to 12 mph S | 90% |
| Thursday | 75°F | Rain Showers | 5 to 10 mph S | 75% |
| Thursday Night | 57°F | Chance Rain Showers | 1 to 5 mph W | 43% |
| Friday | 70°F | Chance Rain Showers | 2 mph NW | 46% |
| Friday Night | 46°F | Chance Rain Showers then Partly Cloudy | 3 mph NW | 42% |
| Saturday | 63°F | Mostly Sunny | 3 to 12 mph NW | 13% |
| Saturday Night | 37°F | Partly Cloudy | 3 to 8 mph NW | 13% |
| Sunday | 61°F | Mostly Sunny | 3 to 8 mph W | 8% |
| Sunday Night | 36°F | Partly Cloudy then Slight Chance Rain Showers | 6 mph W | 21% |
| Monday | 60°F | Slight Chance Rain Showers | 6 to 15 mph NW | 22% |
| Monday Night | 35°F | Slight Chance Rain Showers | 5 to 8 mph W | 22% |
| Tuesday | 64°F | Sunny | 6 to 15 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov) for Greencastle (39.791, -77.727). Updated through the day.
Growing snapshot for Greencastle
Last spring frost
Apr 7
First fall frost
Nov 4
Growing season
209 days
Hardiness zone
7a
More local growing data for Greencastle: nearby ZIP 17225 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Guilford
Marion
Mercersburg
Mont Alto
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, Hagerstown Washington Co Ap, Md (5.5 mi from Greencastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.